<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isall" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in goodList" :key="index">
          <td><input type="checkbox"  v-model="newprice" :value="item.price*item.num"/></td>
          <td>{{ item.name }}</td>
          <td>{{ item.price }}</td>
          <td>
            <button @click="item.num--">-</button>
            {{ item.num }}
            <button @click="item.num++">+</button>
          </td>
          <td>{{ item.price * item.num }}</td>
          <td><button @click="shplicarr(index)">删除</button></td>
        </tr>
      </thead>
      <tbody></tbody>
      <tfoot>
        <tr>
          <td>合计:{{sprices}}</td>
          <td colspan="5"></td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
      newprice:[]
    };
  },
  methods: {
    shplicarr(index) {
      this.goodList.splice(index,1);
    },
  },
  computed: {
    isall: {
      set(val) {
        // 全选框影响 小选框
        this.goodList.forEach((item) => (item.checked = val));
      },
      get() {
        //因为eveny 只有满足 ture 才会执行 不然返回fales
        return this.goodList.every((item) => item.checked);
      },
    },
    sprices(){
        return this.newprice.reduce((item,index)=>{ return ( item+=index)},0)
    }
  },
};
</script>

<style>
</style>